Coating compositions containing functionalized silicones

ABSTRACT

The invention concerns a coating composition, in particular a paint comprising (A) 3 to 30 parts of a latex consisting of organic (co)polymers having a glass transition temperature ranging between −20° C. and 50° C.; (B) 0.05 to 5 parts of an epoxyfunctionalized polyorganosiloxane emulsion; (C) and 100 parts of mineral fillers.

This application under 35 U.S.C. Section 371 of InternationalApplication Number PCT/FR99/02377 filed on Oct. 05, 1999.

The present invention relates to novel coating compositions, inparticular paint compositions. These compositions can be used in variousapplications, such as water paints, roughcasts, transparent coatings,impregnations or semi-thick coatings (STC).

The prior art does not indicate a coating composition capable ofcorrectly and satisfactorily crosslinking by condensation into anelastomer or a crosslinked material which confers, on the finalapplication, for example in the form of a paint, a high wet abrasionresistance (WAR), a satisfactory impermeability to water and asatisfactory permeability to water vapor. In addition, the prior artdoes not indicate coating compositions which have a high and enduringstability on storage (maintenance of the content of VOCs or of alcoholsproduced in situ below a breakdown threshold of the composition).

One of the essential objectives of the present invention is thus toprovide a novel coating composition which confers, on the finalapplication, efficient water-repellency, that is to say high wetabrasion resistance (WAR), satisfactory impermeability to water,satisfactory permeability to water vapor and a satisfactory pearlingeffect. In addition, the novel coating composition has a high andenduring stability on storage.

More specifically, the novel coating composition developed, which formsthe subject-matter of the present invention, comprises:

(A) 3 to 30 parts (solids content at approximately 50% by weight) of alatex composed of particles of organic (co)polymers exhibiting a glasstransition temperature of between −20° C. and 50° C.,

(B) 0.05 to 5 parts (solids content at approximately 65% by weight) ofan epoxyfunctionalized polyorganosiloxane emulsion,

(C) and 100 (solids content at approximately 75% by weight) parts ofinorganic fillers.

In the context of the invention, the parts (A) and (B) form what isknown as the binder of the coating composition.

The latex used in the context of the composition according to theinvention is prepared from polymerizable monomers (1) chosen fromstyrene, butadiene, acrylic esters and/or vinyl nitrites.

The term “acrylic esters” denotes esters of acrylic acid and ofmethacrylic acid with C₁-C₁₂, preferably C₁-C₈, alkanols, such as methylacrylate, ethyl acrylate, propyl acrylate, n-butyl acrylate, isobutylacrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethylmethacrylate, n-butyl methacrylate or isobutyl methacrylate.

The vinyl nitriles include those having from 3 to 12 carbon atoms, inparticular acrylonitrile and methacrylonitrile.

Styrene can be replaced, in all or in part, by amethylstyrene orvinyltoluene.

Other ethylenically unsaturated monomers (2) which can be polymerizedwith the above monomers (1), the amount of which can range up to 40% byweight of the total of the monomers, can also be used for thepreparation of the latex of the composition according to the invention.Mention may be made of:

(a) carboxylic acid vinyl esters, such as vinyl acetate, vinyl versatateor vinyl propionate,

(b) unsaturated ethylenic mono- and dicarboxylic acids, such as acrylicacid, methacrylic acid, itaconic acid, maleic acid or fumaric acid, andmonoalkyl esters of the dicarboxylic acids of the type mentioned withalkanols preferably having 1 to 4 carbon atoms and their N-substitutedderivatives,

(c) amides of unsaturated carboxylic acids, such as acrylamide,methacrylamide, N-methalolacrylamide or -methacrylamide,

(d) ethylenic monomers comprising a sulfonic acid group and its alkalimetal or ammonium salts, for example vinylsulfonic acid,vinylbenzenesulfonic acid, a-acrylamido-methylpropanesulfonic acid or2-sulfoethylene methacrylate,

(e) ethylenically unsaturated monomers comprising a secondary, tertiaryor quaternary amino group or a heterocyclic group comprising nitrogen,for example vinylpyridines, vinylimidazole, aminoalkyl (meth)acrylatesand aminoalkyl(meth)acrylamides, such as dimethylaminoethyl acrylate ormethacrylate, di-tert-butylaminoethyl acrylate or methacrylate,dimethylaminomethylacrylamide or -methacrylamide, as well aszwitterionic monomers, such as sulfopropyl(dimethyl)aminopropylacrylate, and the like,

(f) esters of (meth)acrylic acids with alkanediols preferably comprising2-8 carbon atoms, such as glycol mono(meth)acrylate, hydroxypropylmono(meth)acrylate or 1,4-butanediol mono(meth)acrylate, and monomerscomprising two polymerizable double bonds, such as ethylene glycoldimethacrylate.

According to a preferred alternative form for the choice of the latex,the latter comprises, by weight:

25-90% and preferably 45-75% of styrene and/or acrylonitrile,

75-10% and preferably 55-25% of butadiene and/or acrylates,

0-20% and preferably 1-10% of unsaturated carboxylic acid,

and 0-40% and preferably 0-15% of other unsaturated ethylenic monomers.

The polymerization of the latex is carried out in a way known per se inan aqueous emulsion of the polymerizable monomers in the presence of atleast one radical initiator and preferably of a transfer agent, forexample of the mercaptan type, with a concentration of monomers in thereaction medium generally of between 20 and 60% by weight.

The polymerization can be carried out continuously, batchwise orsemicontinuously with introduction of a portion of the monomerscontinuously and can be of the “seeded” or “incremental” type accordingto any alternative form known for the production of particles with ahomogeneous and heterogeneous structure.

For the preparation of the latex, reference will be made, asnon-limiting example, to the procedures disclosed in patent EP 599 676on behalf of the present applicant company.

Mention may be made, as examples of inorganic fillers of the compositionaccording to the invention, of milled quartz, kaolin, fumed silica,precipitated silica, calcium carbonate, barium sulfate, titanium oxide,talc, hydrated alumina, bentonite, calcium sulfoaluminate, and the like.

The epoxyfunctionalized polyorganosiloxanes of the composition accordingto the invention are linear and/or cyclic. Identical or differentpolyorganosiloxanes can be used within the same coating composition.These polyorganosiloxanes are composed of units of formula (I) and areterminated by units of formula (II) and/or are composed of units offormula (I) which are represented below:

in which:

the R¹ symbols are alike or different and represent:

a linear or branched alkyl radical comprising from 1 to 8 carbon atoms,the alkyl radicals preferably being methyl, ethyl, propyl and octyl,

a cycloalkyl radical comprising between 5 and 8 cyclic carbon atomswhich is optionally substituted,

an aryl radical comprising between 6 and 12 carbon atoms which can besubstituted, preferably phenyl or dichlorophenyl,

an aralkyl part having an alkyl part comprising between 5 and 14 carbonatoms and an aryl part comprising between 6 and 12 carbon atoms which isoptionally substituted on the aryl part by halogens, alkyls and/oralkoxyls comprising 1 to 3 carbon atoms,

the Y′ symbols are alike or different and represent:

the R¹ group,

and/or an epoxyfunctional group, connected to the silicon of thepolyorganosiloxane via a divalent radical comprising from 2 to 20 carbonatoms which can comprise at least one heteroatom, preferably oxygen,

and at least one of the Y′ symbols representing an epoxyfunctionalgroup.

The linear polyorganosiloxanes can be oils with a dynamic viscosity at25° C. of the order of 10 to 10 000 mPa·s at 25° C., generally of theorder of 50 to 5000 mPa·s at 25° C. and more preferably still of 100 to600 mPa·s at 25° C., or gums exhibiting a molecular mass of the order of1000000.

When cyclic polyorganosiloxanes are involved, these are composed ofunits (II) which can be, for example, of the dialkylsiloxy oralkylarylsiloxy type. These cyclic polyorganosiloxanes exhibit aviscosity of the order of 1 to 5000 mPa·s.

Mention may be made, as examples of divalent radicals connecting anorganofunctional group of the epoxy type, of those included in thefollowing formulae:

The dynamic viscosity at 25° C. of all the silicones considered in thepresent description can be measured using a Brookfield viscometeraccording to the AFNOR standard NFT 76 102 of February 1972.

The production of such functionalized polyorganosiloxanes is entirelywithin the scope of a person skilled in the art of the chemistry ofsilicones.

According to an advantageous alternative form, the composition of theinvention comprises from 5 to 100 organofunctional groups per 100 Siunits and preferably from 20 to 40, which makes it possible to obtain anexcellent compromise between the stability of the composition and itswater repellency.

In addition to the three main constituents of the coating composition ofthe invention, the latter can comprise 0.1 to 10 (dry) parts ofadditives, such as antifoamting agent(s), biocide(s), surfactant(s),rheological agent(s), coalescence agent(s), dispersing agent(s),neutralizing agent(s) and thickening agent(s).

For the preparation of the coating composition, the various constituentsare mixed in a way known per se.

The coating composition according to the invention can be appliedaccording to the usual techniques. By way of example, it can be appliedto surfaces by any suitable means, such as brush, sprayer, and the like.The surfaces to which the coating composition according to the inventioncan be applied are various in nature: for example, metal, such asaluminum, wood, cement or brick, with or without precoating with anadhesion primer.

The following examples and tests are given by way of illustration. Theymake possible in particular a better understanding of the invention andmake it possible to reveal all its advantages and to perceive somealternative embodiments.

EXAMPLES AND TESTS

The examples and tests show a high wet abrasion, satisfactoryimpermeability to water and satisfactory permeability to water vapor ofthe coatings obtained from compositions according to the invention. Inaddition, the measurement of the angle of water drops demonstrates thepearling properties of the compositions of the invention.

Various tests were used:

Test of Wet Abrasion Resistance (WAR): DIN standard 53778

Test of permeability to water vapor: DIN standard 52615

Test of water absorption: DIN standard 52617, and

Measurement of the water drop angle.

The tests were modified for the compositions of example F. Thesemodifications are specified in paragraph II of example F.

Example A I. Ecological Matt Paint Compositions

(i) The paint compositions tested are given in table 1 and comprise:

130 g of calcium carbonate, Hydrocarb 90 (Solids content=75%),

20 g of latex, DS 1003 from Rhodia Chimie (Solids content=50%, based onstyrene, butyl acrylate and acrylic acid)

and 0.15 g of polyorganosiloxane emulsion (Solids content=65%), thepolyorganosiloxane corresponding to the formula (III) below

For the compositions A-4 to A-7 of the invention X of thepolyorganosiloxane is the same as:

For the composition A-1, X of the polyorganosiloxane is CH₃. For thecompositions A-2 and A-3, X is the same as OH.

(ii) Emulsification of the polyorganosiloxanes tested.

Emulsification is carried out by the concentrated direct emulsificationmethod using 5% of Soprophor BSU surfactant (ethoxylatedtristyrylphenol), 65% of polyorganosiloxane and 30% of water.

II. Test of the Wet Abrasion Resistance

This test of wet abrasion resistance is based on the test correspondingto DIN standard 53778.

The paint composition is prepared. It is then either coated immediatelyor is coated after aging for one week at 55° C. (in a pot) on a rigidLeneta substrate (200 microns wet).

The paint is subsequently dried for 24 h at 55° C. and thenreconditioned for 24 h at 23° C. and 55% relative humidity.

The dry film is subsequently abraded under wet conditions. The number ofabrasion cycles which it can endure is counted.

III. Results

The results are given in table 1.

TABLE 1 Compositions n WAR_(immediate) WAR_(aged) A-0 (no / 450 470polyorganosiloxane) A-1 13 470 / A-2 33 390 / A-3 81 500 / A-4  8 13001100  A-5 15 760 790 A-6 30 720 730 A-7 100  510 550

IV. Comments

The compositions according to the invention make it possible to increasethe WAR.

The compositions A-0 to A-3 are ineffective.

The increase in the WAR is identical after aging for one week at 55° C.for the compositions according to the invention.

Example B I. Ecological Matt Paint Compositions: Variation in theContent of Polyorganosiloxane

(i) The paint compositions tested are given in table 2 and comprise:

130 dry g of calcium carbonate, Hydrocarb 90 (SC=75%),

20 dry g of latex DS 1003 (SC=50%),

and 0.15 dry g of polyorganosiloxane with the composition A-5.

(ii) The emulsification of the polyorganosiloxane is identical to theabove.

II. Tests Carried Out

(i) Measurement of the WAR

The measurement of the WAR is carried out as above.

(ii) Measurement of the water drop angle

The measurement of the water drop angle is carried out on identical dryfilms. To do this, the angle which this drop of water makes with thesurface of the film is measured.

III. Results

The results are given in table 2.

TABLE 2 Content (x in g)  0 0.15 0.5 1 1.5 3 WAR_(immediate) 690 9801700 2300 4200 5400 Water drop angle  73° 87 94 97 100 97

IV. Comment

The higher the concentration of polyorganosiloxane, the greater the WAR.

In addition, the higher the concentration of polyorganosiloxane, thegreater the angle which the drop of water makes. Above 90°, the surfaceis pearling. Thus, a satisfactory pearling effect is observed from 3% ofpolyorganosiloxane with respect to the latex (weight/weight).

Example C I. Ecological Matt Paint Compositions

(i) The paint compositions tested are given in table 3 and comprise:

130 g of calcium carbonate, Hydrocarb 90 (Solids content=75%),

20 g of latex, DS 1003 from Rhodia Chimie (Solids content=50%),

and 0.15 g of linear polyorganosiloxane emulsion (Solids content=65%),the polyorganosiloxane corresponding to the formula (IV) below:

 in which X is the same as:

TABLE 3 Concentration of Si- epoxy unit/total of Compositions x y x + ySi units C-1 23 2 25  7% C-2 11 2 13 13% C-3 21 4 25 15% C-4 6 2 8 20%C-5 9 4 13 27%

(ii) The emulisification of the polyorganosiloxanes is carried out asabove.

II. Test Carried Out

The measurement of the WAR is carried out as above.

III. Results

See table 4.

TABLE 4 Compositions WAR_(immediate) WAR_(aged) No polyorganosiloxane600 530 C-1 950 960 C-2 1000 1100 C-3 990 990 C-4 1500 1400 C-5 16001700

IV. Comment

The compositions according to the invention with a polyorganosiloxanefor which the epoxyfunctional groups are not at the chain end are justas effective as a polyorganosiloxane for which the epoxyfunctionalgroups are at the chain end.

The higher the degree of grafting, the greater the WAR. The compositionsare always stable after aging for 1 week at 55° C.

Example D I. Ecological Matt Paint Compositions with Variation in theLevel of Si-Epoxy/Total of Si Units

(i) The paint compositions tested are given in table 5 and comprise:

130 g of calcium carbonate, Hydrocarb 90 (Solids content=75%),

20 g of latex, DS 1003 from Rhodia Chimie (Solids content=50%)

and 0.15 g of linear polyorganosiloxane emulsion (Solids content=65%),the polyorganosiloxane corresponding to one of the formulae below:

 in which X is the same as:

TABLE 5 Concentration of Si-epoxy unit/ Compositions X y n total of Siunits) D-1 (formula IV) 8 7 / 41% D-2 (formula IV) 3 8 / 62% D-3(formula IV) 0 20  / 91% D-4 (formula III) / / 1 100% 

(ii) The emulsification of the polyorganosiloxanes is carried out as inthe preceding examples.

II. Test Carried Out: Measurement of the WAR

The measurement of the WAR is carried out as above.

III. Results

The results are given in table 6.

TABLE 6 Compositions WAR_(immediate) WAR_(aged) D-0 (without 790 630polyorganosiloxane) D-1 1800 1600 D-2 2600 1600 D-3 4600 1600 D-4 620001400

VI. Comment

The higher the percentage of Si-epoxy/total of Si units, the moreeffective the composition with respect to fresh baths.

However, for the aged compositions, the WAR results are not similar tothose of the immediately tested compositions. This is because it isnoticed that, beyond 40% of Si-epoxy, the difference of WAR_(immediate)and WAR_(aged) is very large, which means that the compositions are notstable.

Thus, the optimal level of Si-epoxy/total of Si units of thepolyorganosiloxane is below 40%.

Example E I. Breathing Exterior Paint Compositions

The compositions prepared all comprise 100 g of calcium carbonate,Hydrocarb 90, and 12 g of latex, DS 910 from Rhodia Chimie, with 10% ofcoalescence agent, Texanol from Eastman Kodak.

(i) The compositions according to the invention comprise a 3rdcomponent, that is to say X g of polyorganosiloxane emulsion, thepolyorganosiloxane having the formula:

in which n is equal to 8 and X is the same as:

They correspond to the compositions E-6 to E-9. The amounts ofpolyorganosiloxanes vary within the compositions E-6 to E-9 and aregiven in table 7. The emulsification of the polyorganosiloxane iscarried out in a way identical to that used in example 1.

(ii) The compositions E-2 to E-5 comprise, instead of thepolyorganosiloxane, a reference silicone resin, Rhodorsil 865A fromRhodia Chimie. The amounts of resin vary within the compositions E-2 toE-5 and are given in table 7.

II. Tests Carried Out

(i) WAR and water drop angle.

The WAR and the water drop angle are measured as in the precedingexamples.

(ii) Permeability to water.

The measurement of the permeability to water is made in agreement with aprocedure based on DIN standard No. 52617.

The paint composition is coated on an earthenware tile (thickness of thepaint: 2 mm). After partial evaporation of the water, the half-dry paintis cut out and detached as a disk with a diameter of 40 mm, which makesit possible to obtain an unsupported paint.

After drying and reconditioning the paint, the latter is immersed inwater. Gravimetric monitoring makes it possible to determine the amountof water taken up by the paint.

From the curve of the readings obtained, the water absorptioncoefficient W is determined as a function of the formula:m(t)=m₀+WS.t^(½), where m is the mass of the composite, S is its surfacearea (counting both faces) and t is the time.

iii) Permeability to water vapor.

The measurement of the permeability to water vapor is made in agreementwith a procedure based on DIN standard No. 52615. For this, the Sdfactor, which is equal to 0.09/Pe, is determined; this Sd factorcorresponds to the thickness of air which would have the samepermeability as a paint with a thickness of 100 microns (Pe is ing⁺¹h⁻¹m⁻²mmHg⁻¹ and Sd is in m).

The unsupported paint, obtained as above, is used as lid on a pot filledwith water.

The pot is placed at a temperature of 23° C. and a relative humidity of50%. The amount of water present in the pot is monitored as a functionof time.

The permeability to water vapor Pe is defined by: m(t)=m₀−(Pe.S.Δp).t,where m is the mass of water and Δp is the difference in partialpressure of the water between the pot and the atmosphere, i.e. 10.54mmHg.

III. Results

The results are given in table 7.

IV. Comments

A marked improvement in the WAR is recorded with the compositions of theinvention with respect to the paint compositions in which the 3rdcomponent is a resin.

The permeability to water is markedly improved for the compositionsaccording to our invention. In the same way, the pearling aspect of thepaint is reinforced by the compositions according to the invention E-6to E-9.

TABLE 7 Amount of Water Compo- the 3rd PVC Sd W drop sitions component %WAR m kg/m²h^(1/2) angle E-0 0 77 13000  0.0103 0.065 75 E-2 2 g 73 52000.0124 0.055 73 E-3 5 g 69 — 0.0118 0.047 66 E-4 10 g 63 2500 0.01330.06 100 E-5 20 g 54 1600 — 0.025 91 E-6 0.5 g 75 — 0.0124 0.015 116 E-71 g 74 — 0.0125 0.013 119 E-8 1.5 g 73 — 0.0137 0.009 120 E-9 2 g 7379000 0.0144 0.008 109 PVC = pigment volume capacity

Example F I. Breathing Paint Compositions (PVC=70%)

(i) The paints tested, E10 to E13, are formulated from a pigment pastewith the composition given in table 8. The paste is dispersed at 3000rev/min for 15 minutes.

(ii) The paints comprise other ingredients added within the dispersionsaccording to the invention. The types and the amounts of the additionalingredients are shown in table 9. After addition, the medium is stirredat 500 rev/min for 15 minutes.

The emulsification of the silicones used is carried out in a wayidentical to that used in example 1.

The polyorganosiloxane used within the emulsion according to theinvention is of formula (IV), where y is equal to 4, x is equal to 9 andthe X functional group is the same as:

TABLE 9 E10 E11 E12 E13 Styrene-acrylic dispersion 9.2 9.2 15.8 9.4 withSC = 50% (Rhodopas ® DS910 from Rhodia Chimie). Non-epoxidized silicone10.0 0 0 0 emulsion with SC = 42% (Rhodorsil ® 865A from Rhodia Chimie).Non-epoxidized silicone 0 8 0 6.9 emulsion with SC of 53% (Rhodorsil ®1854 PEX from Rhodia Chimie). Epoxidized polyorganosiloxane 0 0 1.9 1 offormula (IV) with SC of 50%. Water 0.5 2.5 2 2.4

TABLE 8 Ingredients Weight Functions Water 20.1 Na hexametaphosphate(10% 0.5 Neutralizing agent H₂O) Proxel GXL from Zeneca 0.3 BiocideRhodoline DP 1120 from 0.3 Dispersing agent Rhodia Chimie Rhodoline DF6002 from 0.2 Antifoaming agent Rhodia Chimie Natrosol 250H from Aqualon0.2 Thickening agent RCL 568 from Millenium 12.1 Titanium dioxideOmyacarb SGU from Omya 24.1 Filler Calibrite SL from Omya 10.1 FillerTalc 10 MO from Luzenac 4 Filler Plastorit 000 from Luzenac 4 FillerCelite 281 from Manville 3 Filler Texanol from Eastman 1.1 Coalescenceagent Rhodoline RH 5210 from 0.3 Thickening agent Rhodia Chimie

II. Tests Carried Out

(i) WAR according to DIN standard 53778 part 2.

This factor, expressed as number of cycles, represents the ability of afilm of paint of defined thickness to withstand the abrasive actionexerted by the to-and-fro movement of a brush in the presence of asurfactant-based solution.

(ii) Permeability to water vapor

The measurement of the permeability to water vapor is made in agreementwith a procedure based on EN standard No. 1062-3.

The Sd coefficient, expressed in meters, which represents the thicknessof static air which has the same permeability to water vapor, iscalculated. This coefficient is obtained by calculation frommeasurements of losses in weight of a dish filled with water and with anammonium dihydrogenphosphate solution and closed by a polyethylenesubstrate coated with the paint to be evaluated.

<: permeability to water vapor: V=240×m/A×t(g.m²/24 h)

A: surface area of the sample: 50.27 cm²

m: loss in mass mg

t: time 72 h

Sd: 21/V (m)

(iii) Permeability to water

The measurement of the permeability to water is made in agreement with aprocedure based on EN standard No. 1062-2.

The W factor, expressed in kg.m⁻².h^(−0.5), which represents the abilityof the paint coating to absorb liquid water (per unit of surface areaand of time), is calculated. It is obtained by weighing: the uptake inweight of a liking tile coated with the paint to be tested and kept incontact with a surface saturated with water is monitored.

III. Results

The results are given in table 10.

TABLE 10 Pigment volume capacity WAR Sd W Water drop PVC (cycles) (m)(kg/m²h^(1/2) angle (°) E10 70% 1500 0.05 0.16 80 E11 70% 3800 0.03 0.1480 E12 70% >>5000 0.03 0.03 130 E13 70% 4200 0.03 0.07 120

IV. Comments

An improvement in the WAR with the compositions of the invention isrecorded with respect to the compositions in which non-epoxidizedsilicones are introduced.

The permeability to water is improved for the compositions according toour invention. Furthermore, the pearling aspect of the paints accordingto the invention is reinforced.

What is claimed is:
 1. A coating composition comprising: (A) 3 to 30parts, with solids content at about 50% by weight, of a latex composedof particles of organic (co)polymers exhibiting a glass transitiontemperature of between −20° C. and 50° C., (B) 0.05 to 5 parts, withsolids content at about 65% by weight, of an epoxyfunctionalizedpolyorganosiloxane emulsion, and (C) and 100 parts, with solids contentat about 75% by weight, of inorganic fillers.
 2. The composition asclaimed in claim 1, wherein the latex is prepared from monomers (1)which are styrene, butadiene, acrylic esters or vinyl nitrites.
 3. Thecomposition as claimed in claim 2, wherein the latex preparationcomprises further ethylenically unsaturated monomers (2) which can bepolymerized with said monomers (1), the amount of which is up to 40% byweight of the total of the monomers, said monomers (2) being: (a)carboxylic acid vinyl esters, (b) unsaturated ethylenic mono- anddicarboxylic acids, monoalkyl esters of unsaturated ethylenicdicarboxylic acids with alkanols having 1 to 4 carbon atoms, (c) amidesof unsaturated carboxylic acids, (d) ethylenic monomers comprising asulfonic acid group, its alkali metal, its ammonium salts, (e)ethylenically unsaturated monomers comprising a secondary, tertiary orquaternary amino group or a heterocyclic group comprising nitrogen,aminoalkyl(meth)acrylamides, or zwitterionic monomers, (f) esters of(meth)acrylic acids with alkanediols comprising 2-8 carbon atoms, ormonomers comprising two polymerizable double bonds.
 4. The compositionas claimed in claim 3, wherein said monomers (2) is: (a) vinyl acetate,vinyl versatate, vinyl propionate, (b) acrylic acid, methacrylic acid,itaconic acid, maleic acid, fumaric acid, (c) acrylamide,methacrylamide, N-methalolacrylamide, N-methalolmetha-acrylamide, (d)vinylsulfonic acid, vinylbenzenesulfonic acid,acrylamidomethylpropanesulfonic acid, 2-sulfoethylene methacrylate, (e)dimethylaminoethyl acrylate, dimethylaminoethyl methacrylate,di-tert-butylaminoethyl acrylate, di-tert-butylaminoethyl methacrylate,dimethylaminomethylacrylamide, dimethylaminomethylmethacrylamide,sulfopropyl(dimethyl)aminopropyl acrylate. (f) glycolmono(meth)acrylate, hydroxypropyl mono(meth)acrylate, 1,4-butanediolmono(meth)acrylate, or ethylene glycol dimethacrylate.
 5. Thecomposition as claimed in claim 3, wherein the latex comprises, byweight: 25-90% of styrene and/or acrylonitrile, 75-10% of butadieneand/or acrylates, 0-20% of unsaturated carboxylic acid, and 0-40% ofother unsaturated ethylenic monomers.
 6. The composition as claimed inclaim 5, wherein the latex comprises, by weight: 45-75% of styreneand/or acrylonitrile, 55-25% of butadiene and/or acrylates, 1-10% ofunsaturated carboxylic acid, and 0-15% of other unsaturated ethylenicmonomers.
 7. The composition as claimed in claim 1, wherein theepoxy-functionalized polyorganosiloxane is composed of units of formula(I) and is terminated by units of formula (II) or is composed of unitsof formula (I) which are represented below:

wherein: the R¹ symbols are alike or different and represent: a linearor branched alkyl radical comprising from 1 to 8 carbon atoms, acycloalkyl radical comprising between 5 and 8 cyclic carbon atoms whichis optionally substituted, an aryl radical comprising between 6 and 12carbon atoms which is optionally substituted, an aralkyl part having analkyl part comprising between 5 and 14 carbon atoms and an aryl partcomprising between 6 and 12 carbon atoms which is optionally substitutedon the aryl part by halogens, alkyls or alkoxyls comprising 1 to 3carbon atoms, the Y′ symbols are alike or different and represent: theR¹ group, or an epoxyfunctional group, connected to the silicon of thepolyorganosiloxane via a divalent radical comprising from 2 to 20 carbonatoms optionally comprising at least one oxygen atom, and at least oneof the Y′ symbols representing an epoxyfunctional group.
 8. Thecomposition as claimed in claim 7, wherein the epoxyfunctional groupsare:


9. The composition as claimed in claim 1, wherein the coating is apaint.
 10. A paint binder comprising: (A) 3 to 30 parts, with solidscontent at about 50% by weight, of a latex composed of particles oforganic (co)polymers exhibiting a glass transition temperature ofbetween −20° C. and 50° C., and (B) 0.05 to 5 parts, with solids contentat about 65% by weight, of an epoxyfunctionalized polyorganosiloxaneemulsion.